Water-tube boiler.



No. 659,006. Patented Oct. 2, I900.

J. I. THORNYCROFT.

WATER TUBE BOILER.

(Application fild July 6, 1899.)

(No Model.)

JOHN ISAAC THORNYCROFTQ OF LONDON,

PATENT OFFICE.

EN GLAND.

WATER-TU BE BOILER.

SPECIFICATION forming part of Letters Patent No; 659,

06, dated October 2, 1900.

Application filed July 6, 1899. Serial No. 722,923. (No model.)

To wll whom it may concern- Be it known that I, J our; ISAAC THoRNY- CROFT, a subject of the Queen of Great Britaim and Ireland, residing at Chiswick, London, in the county of Middlesex, England, have invented Improvements in Water-Tube Boilers, of which the following is a specification.

This invention has reference to water-tube boilers of the so-called' Daring type, (see Thornycrofts patent, No. 452,401,) wherein, inter alia, an upper steam and water vessel is connected to three lower water vessels by groups of bent water-tubes so disposed that some of them form dues in which other tubes are located and through which the products of combustion escaping from the fire-boxes formed by and between the groups of tubes pass on their way to the chimney or uptake. In such boilers it sometimes happens, especially when they are of smallheight, that the hot gases are not uniformly distributed throughout the whole length of the fines, but tendto take a short path to the chimney, with the result that the whole of the heating-surface of the tubes is not utilized to the greatest advantage. i

Nowthis in vention has for its object to prevent or mitigate this drawback, for which purpose some of the tubes within each inner or outerfiue or in each of the inner and outer fines are arranged to form,.except at their ends, one or more close walls of tubes that serve to divide the due lengthwise into two or more compartments that communicate with each other at their upper and lower ends through passages formed by and between the upper and lower end portions of the tubes after the manner of the inlet and outlet sages ordinarily formed between the upper and lower .ends of the tubes constituting the innerand outer walls of the flue, the arrangement being such that hot gases on entering the lower end of the flue through the lower passages in that wall thereof which is next the firebox. will divide, a portion of them passing up the compartment of the due next the fire box and the remaining portion passing through the lower passages in the intervinsane hichisn xt h arrangod. in rows.

mediate close wall or walls of tubes and rising through the other compartment or compartments of the flue, the streams of hot gas upon reaching the upper endsof the compartmentsfiowing through the passages left between the upper ends of the intermediate wall or walls of tubes and the inner or outer walls or inner and according to the particular design of the boiler, and thence passing to the chimney. The height of the passages through the upper and lower portions of the intermediate close wall or walls of tubes can be varied to suit requirement. The height of the lower passages will usually lower passages in that wall of the correspondp The invention can be applied in connection with various arrangements of water-tubes-forming flucs at one or at each side of the fire-box or each fire-box of the boiler. F

The accompanying illustrative drawing shows in'cross-section one arrangement of boiler of the kind referred to embodying the present invention.

The bent water-tubes that connect the upper steam and water vessel a to the lower central water vessel 1) enter the former vessel-at each side thereof and are arranged in rows whereof the two ihne'r rows c 01-11. 6., those nearest to the vertical plane of the longitudinal center of the boiler-and the two outer rows e f-i. fire-box-are bent to form, excepting as to their ends, tube-Walls which constitute flues g, wherein the remaining tubes are arranged in rows, the two inner walls of the two fines 9 having between them a central space or due IL, in connection with a chimney i at the end of the boiler. Each of the outer lower water vessels j is connected with the upper vessel a also by several rows of tubes, whereof the twoouter rows 70 Z and the two inner rows in. m are made to form (excepting as to the ends of the tubes) walls-0t". a flue 0, within which the remaining tubes of the group are The Outer wall of each in-nerjfiue g and the inner-(wall of each outer ,fiue-o meet at p at a suitable distance above outer walls of the dues,

be less than that of the i e., those next to the I between the wall-tubes, whcrcb) products:

of combustion from each llrc-box s can enter the respective titles 1 0, up which they flow The upper portions of the tubes (fll and c j' of both walls of each inner line 9 and those Ni ii of the inhcr wall of each outer flue o are arranged to al'ford passages between such portions of the said tubes whereby the upper ends of both flues and o communicate with each other and with the central space or line 1t.

Within each inner tlue g, and also, it may he, as shown, within each outer flue o, is formed an intermediate close wall ll of tubes, as and for the pn rposelioreinbefore described, the passages I in the lower portion of each such wall beinc usually of less height than the inlctpass:n es r in the adjacent wall of the Line, and the passages to in the upper portion of the said intermediate wall 1/ b ingot' about the same length, more or less, asthose -viz.,f in the upper portions of the liuowalls. As wi'rl be seen, the arrangement is such thatothe hot gases ascending the separate lines. 1/ and not each lire-box s reunite at the top and thence t'low through the upper passages [of the inner walls of the inner lines g to the central space or llno l: and thence to the chimney 1'. 'lho upper steam and water vessel o is or may be connected to the lower central vessel 1) by downtakc-t ubcs ,r, extending: through the central space or llnc It, and to the lower outer Ycsscls by separate oxtcrnal dowutalu-d ubcs 1 as shown by dotted lines.

What I claim is 1. In a water-tube boiler, an upper steam and water vessel, a lower water vessel, watertubes con ncct in; t he two vessels and arranged to form a llnowith ipcnings tor inlet and outlot of hot gases, and other water tubcs connecting, said vcsscls and arranged within said line so as to form, except at their ends, one or more close walls that divide said flue longitudinally into two or more compartments that communicate with each other at top and bottom,substantiallyasdcscribcd for the purpose specilied.

.3. In a ater-tubeboiler, thccombi'nation of an upper steam and" water vessel, a lower water vessel, and water-tubes so disposed that some of thom Form a lluc in which other tubes are located, some of these latter tubes being arranget'l to form, except at their ends, one or more intermediate close walls tliatdivide the tluc lengthwise into twoor more compartments that. communicate with each other at their upper and'lowcr ends through passages formed by and-between the upper and lower cud portions of the tubes forming said intermediate wall or walls; substantially as dcscribml tor the purpose specified.

t l l l l l l l 3;. In a water-tube hoilpr, an upper steam and water vessel, a lower. water vessel, two tirc-boxcs, two groups of watcr-tubcs connectin said vessels and located between said lireboxes and arranged to form a central exittiue between them, the tubes in each group being arranged to form two or more adjacent tlues or flnc-compartments that are each in comn'iunication at one cndwith the adjacent firebox and at the other end with the central 'tluc, substantially as described.

t Ina water-tube boiler, an upper steam and waterrcssel, three lower water vessels, an uptake, water-tubes connecting said upper vessel to each of said lower vessels and arranged in four-groups so as to form the sides of two lire-boxes, the tubes composing each inner group beingarranged to form a fine having inlets and-outlets for hot gases and in which other tubes of the group are located, some of these latter tubes being, arranged to form, except at their ends, one or more intermediate close walls which divide the flue lengthwise into two or more compartment-s thatcominunicate with each other at their uppcrand lower ends and also with the adjacent lire-box, and with said uptake, substantially as described. i

5. in a water-tube boiler, an upper stean and water vessel, three lower water vessels, an uptake, water-tubes connecting said upper vessel to each of said lower vesselsand arranged in four groups so as to form the sides of two tire-boxes, the tubes of each group being arranged to form two or more adjacent lines or flue-compartments that are each in communication at one end with the adjacent lire-box and at the other end with the uptake, substantially as described.

3. In a water-tube boiler, the combination of an upper steam and water vessel, three lower water vessels, two inner and two outer groups of water-tubes connecting the upper vessel to the lower vessels and arranged to form a central exit-line two lire-boxes and two inner and two outer flues, the inner and outer titles at the inner and outer sides of each lire-box being in comm nnicatiou with the lire-box at their lower ends and in comm unication with each other and with the central line atthcir uppcreuds, and an intermediate close wall of tubes arranged within each inner fine, so as to divide the same into two ad j acent compartin'ents that are in comuninication with.

cachcthenat thcir nppci' and lower ends by passages formed, by and between thc t-ube tends,substantially as described.

7. Inawatcr-titbcb an upper steam an d,\ va.ter vessel, three 'lowcr "water vessels, twq,iinier;:and' outer groups of water-tubes ct inncetin-gthe-upper vessel to the l'owervess elsand arranged to form a central tut-n t twofliroboxes and two inner and ,nutor litiesQthe inner and outer tines at the inner and outer sidcs'of each lire-box being iler, the combination of in communication with the fire-box at their ends by passages formed'by and between the lower ends and in communication wit-beach tube ends, substantially as described. 10 other and with the central flue at their upper Signed at 77 Cornhil], in the city of Lonends, and an intermediate close wall of tubes don, England, this 15th day of June, 1899.

arranged within eaoh inner and outer flue so JOHN ISAAC THO BNYGROFT. as to divide each of such lines into two adja- Witnesses: cent compartments that are in communica- EDMUND S. SNEWIN',

tion with each other at their upper and lower WM. 0. BROWN.

-It is hereby certified that in Letters Patent N 0. 659,006, granted October 2, 1900, upon the application of John Isaac Thornycroft, of London, England, for an improvement in \Vater-Tube Boilersfl errors appear in the printed specification requiring correction, as follows: In line 125, pa.ge 2, before the word outer the word two should be inserted, and line 129, same page, before the word outer, the first time it appears in the line the word two should be inserted; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of" the case in the Patent Ofiice.

- Letters Patent No. 659,006.

Signed, counter-signed, and sealed this 6th day of November, A. ID., 1900.

[SEAL] F. L. CAMPBELL, Assistant Secretary of the Interior. .2 Oountersigni H i G. H. DUELL,

Commissioner of Patents.

i h v 

